[PATCH] RDMA/core: Fix uninitialized gid in ib_nl_process_good_ip_rsep()

[Kriish Sharma]

KMSAN reported a use of uninitialized memory in hex_byte_pack()
via ip6_string() when printing %pI6 from ib_nl_handle_ip_res_resp().
If the LS_NLA_TYPE_DGID attribute is missing, 'gid' remains
uninitialized before being used in pr_info(), leading to a
KMSAN uninit-value report.

Reported-by: syzbot+938fcd548c303fe33c1a@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=938fcd548c303fe33c1a
Fixes: ae43f8286730 ("IB/core: Add IP to GID netlink offload")
Signed-off-by: Kriish Sharma <kriish.sharma2006@xxxxxxxxx>
---
 drivers/infiniband/core/addr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/addr.c b/drivers/infiniband/core/addr.c
index 61596cda2b65..4c602fcae12f 100644
--- a/drivers/infiniband/core/addr.c
+++ b/drivers/infiniband/core/addr.c
@@ -99,7 +99,7 @@ static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
 static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
 {
 	const struct nlattr *head, *curr;
-	union ib_gid gid;
+	union ib_gid gid = {};
 	struct addr_req *req;
 	int len, rem;
 	int found = 0;
-- 
2.34.1